/*************************************************************************/
/*  base_object_glue.cpp                                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
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/*************************************************************************/

#include "core/object/class_db.h"
#include "core/object/ref_counted.h"
#include "core/string/string_name.h"

#include "../csharp_script.h"
#include "../mono_gd/gd_mono_cache.h"
#include "../mono_gd/gd_mono_class.h"
#include "../mono_gd/gd_mono_internals.h"
#include "../mono_gd/gd_mono_marshal.h"
#include "../mono_gd/gd_mono_utils.h"
#include "../signal_awaiter_utils.h"
#include "arguments_vector.h"

void godot_icall_Object_Disposed(MonoObject *p_obj, Object *p_ptr) {
#ifdef DEBUG_ENABLED
	CRASH_COND(p_ptr == nullptr);
#endif

	if (p_ptr->get_script_instance()) {
		CSharpInstance *cs_instance = CAST_CSHARP_INSTANCE(p_ptr->get_script_instance());
		if (cs_instance) {
			if (!cs_instance->is_destructing_script_instance()) {
				cs_instance->mono_object_disposed(p_obj);
				p_ptr->set_script_instance(nullptr);
			}
			return;
		}
	}

	void *data = CSharpLanguage::get_existing_instance_binding(p_ptr);

	if (data) {
		CSharpScriptBinding &script_binding = ((Map<Object *, CSharpScriptBinding>::Element *)data)->get();
		if (script_binding.inited) {
			MonoGCHandleData &gchandle = script_binding.gchandle;
			if (!gchandle.is_released()) {
				CSharpLanguage::release_script_gchandle(p_obj, gchandle);
			}
		}
	}
}

void godot_icall_RefCounted_Disposed(MonoObject *p_obj, Object *p_ptr, MonoBoolean p_is_finalizer) {
#ifdef DEBUG_ENABLED
	CRASH_COND(p_ptr == nullptr);
	// This is only called with RefCounted derived classes
	CRASH_COND(!Object::cast_to<RefCounted>(p_ptr));
#endif

	RefCounted *rc = static_cast<RefCounted *>(p_ptr);

	if (rc->get_script_instance()) {
		CSharpInstance *cs_instance = CAST_CSHARP_INSTANCE(rc->get_script_instance());
		if (cs_instance) {
			if (!cs_instance->is_destructing_script_instance()) {
				bool delete_owner;
				bool remove_script_instance;

				cs_instance->mono_object_disposed_baseref(p_obj, p_is_finalizer, delete_owner, remove_script_instance);

				if (delete_owner) {
					memdelete(rc);
				} else if (remove_script_instance) {
					rc->set_script_instance(nullptr);
				}
			}
			return;
		}
	}

	// Unsafe refcount decrement. The managed instance also counts as a reference.
	// See: CSharpLanguage::alloc_instance_binding_data(Object *p_object)
	CSharpLanguage::get_singleton()->pre_unsafe_unreference(rc);
	if (rc->unreference()) {
		memdelete(rc);
	} else {
		void *data = CSharpLanguage::get_existing_instance_binding(rc);

		if (data) {
			CSharpScriptBinding &script_binding = ((Map<Object *, CSharpScriptBinding>::Element *)data)->get();
			if (script_binding.inited) {
				MonoGCHandleData &gchandle = script_binding.gchandle;
				if (!gchandle.is_released()) {
					CSharpLanguage::release_script_gchandle(p_obj, gchandle);
				}
			}
		}
	}
}

void godot_icall_Object_ConnectEventSignals(Object *p_ptr) {
	CSharpInstance *csharp_instance = CAST_CSHARP_INSTANCE(p_ptr->get_script_instance());
	if (csharp_instance) {
		csharp_instance->connect_event_signals();
	}
}

MonoObject *godot_icall_Object_weakref(Object *p_ptr) {
	if (!p_ptr) {
		return nullptr;
	}

	Ref<WeakRef> wref;
	RefCounted *rc = Object::cast_to<RefCounted>(p_ptr);

	if (rc) {
		REF r = rc;
		if (!r.is_valid()) {
			return nullptr;
		}

		wref.instantiate();
		wref->set_ref(r);
	} else {
		wref.instantiate();
		wref->set_obj(p_ptr);
	}

	return GDMonoUtils::unmanaged_get_managed(wref.ptr());
}

int32_t godot_icall_SignalAwaiter_connect(Object *p_source, StringName *p_signal, Object *p_target, MonoObject *p_awaiter) {
	StringName signal = p_signal ? *p_signal : StringName();
	return (int32_t)gd_mono_connect_signal_awaiter(p_source, signal, p_target, p_awaiter);
}

MonoArray *godot_icall_DynamicGodotObject_SetMemberList(Object *p_ptr) {
	List<PropertyInfo> property_list;
	p_ptr->get_property_list(&property_list);

	MonoArray *result = mono_array_new(mono_domain_get(), CACHED_CLASS_RAW(String), property_list.size());

	int i = 0;
	for (const PropertyInfo &E : property_list) {
		MonoString *boxed = GDMonoMarshal::mono_string_from_godot(E.name);
		mono_array_setref(result, i, boxed);
		i++;
	}

	return result;
}

MonoBoolean godot_icall_DynamicGodotObject_InvokeMember(Object *p_ptr, MonoString *p_name, MonoArray *p_args, MonoObject **r_result) {
	String name = GDMonoMarshal::mono_string_to_godot(p_name);

	int argc = mono_array_length(p_args);

	ArgumentsVector<Variant> arg_store(argc);
	ArgumentsVector<const Variant *> args(argc);

	for (int i = 0; i < argc; i++) {
		MonoObject *elem = mono_array_get(p_args, MonoObject *, i);
		arg_store.set(i, GDMonoMarshal::mono_object_to_variant(elem));
		args.set(i, &arg_store.get(i));
	}

	Callable::CallError error;
	Variant result = p_ptr->call(StringName(name), args.ptr(), argc, error);

	*r_result = GDMonoMarshal::variant_to_mono_object(result);

	return error.error == Callable::CallError::CALL_OK;
}

MonoBoolean godot_icall_DynamicGodotObject_GetMember(Object *p_ptr, MonoString *p_name, MonoObject **r_result) {
	String name = GDMonoMarshal::mono_string_to_godot(p_name);

	bool valid;
	Variant value = p_ptr->get(StringName(name), &valid);

	if (valid) {
		*r_result = GDMonoMarshal::variant_to_mono_object(value);
	}

	return valid;
}

MonoBoolean godot_icall_DynamicGodotObject_SetMember(Object *p_ptr, MonoString *p_name, MonoObject *p_value) {
	String name = GDMonoMarshal::mono_string_to_godot(p_name);
	Variant value = GDMonoMarshal::mono_object_to_variant(p_value);

	bool valid;
	p_ptr->set(StringName(name), value, &valid);

	return valid;
}

MonoString *godot_icall_Object_ToString(Object *p_ptr) {
#ifdef DEBUG_ENABLED
	// Cannot happen in C#; would get an ObjectDisposedException instead.
	CRASH_COND(p_ptr == nullptr);
#endif
	// Can't call 'Object::to_string()' here, as that can end up calling 'ToString' again resulting in an endless circular loop.
	String result = "[" + p_ptr->get_class() + ":" + itos(p_ptr->get_instance_id()) + "]";
	return GDMonoMarshal::mono_string_from_godot(result);
}

void godot_register_object_icalls() {
	GDMonoUtils::add_internal_call("Godot.Object::godot_icall_Object_Disposed", godot_icall_Object_Disposed);
	GDMonoUtils::add_internal_call("Godot.Object::godot_icall_RefCounted_Disposed", godot_icall_RefCounted_Disposed);
	GDMonoUtils::add_internal_call("Godot.Object::godot_icall_Object_ConnectEventSignals", godot_icall_Object_ConnectEventSignals);
	GDMonoUtils::add_internal_call("Godot.Object::godot_icall_Object_ToString", godot_icall_Object_ToString);
	GDMonoUtils::add_internal_call("Godot.Object::godot_icall_Object_weakref", godot_icall_Object_weakref);
	GDMonoUtils::add_internal_call("Godot.SignalAwaiter::godot_icall_SignalAwaiter_connect", godot_icall_SignalAwaiter_connect);
	GDMonoUtils::add_internal_call("Godot.DynamicGodotObject::godot_icall_DynamicGodotObject_SetMemberList", godot_icall_DynamicGodotObject_SetMemberList);
	GDMonoUtils::add_internal_call("Godot.DynamicGodotObject::godot_icall_DynamicGodotObject_InvokeMember", godot_icall_DynamicGodotObject_InvokeMember);
	GDMonoUtils::add_internal_call("Godot.DynamicGodotObject::godot_icall_DynamicGodotObject_GetMember", godot_icall_DynamicGodotObject_GetMember);
	GDMonoUtils::add_internal_call("Godot.DynamicGodotObject::godot_icall_DynamicGodotObject_SetMember", godot_icall_DynamicGodotObject_SetMember);
}